How do I specify SSH options for SSHFS?

Question

I had originally asked this as a follow-up question here. Unfortunately, there haven't been any replies so I am posting it as its own question.

According to the documentation, you are supposed to be able to use ssh options with sshfs. How do you do this? I have tried something like -o User=joe but then fuse gives me an error saying that "User" is not a recognized option.

Also, help with this question would also be appreciated.

Edit:

I am specifically referring to the following from the manpage for sshfs.

SSHFS options:

  -p PORT
         equivalent to '-o port=PORT'

  -C     equivalent to '-o compression=yes'

  ⋮

  -o password_stdin
         read password from stdin (only for pam_mount!)

  -o SSHOPT=VAL
         ssh options (see man ssh_config)

I am trying to specify the remote username separate from the host (in other words, not user@host:dir). The reason is that particular format is not friendly with some institutionally assigned usernames. For example, if the institution assigns the user name [email protected], programs such as sshfs and curlftpfs will not correctly interpret [email protected]@host:dir. Instead, they will try to login as First.Last to the host institution.edu@host.

Could you explain a bit more about idmap? I am not literate enough to understand what the manpage is saying.

Edit:

If I use idmap, I am going to have to create hardcoded files. I was hoping to avoid that so that the user can just use a single command without needing to know how it works in the background. Eventually, other people might be using it even after I leave. Even so, the documentation says the file format is username:uid. Which is the local and which is remote?

That is how you specify options, I don't think user=joe is a valid option. My guess is you want -o idmap=user . See the man page for valid mount options https://linux.die.net/man/1/sshfs or update your question as I am not sure what your problem is other than an invalid option or if you need to manually map users — Panther, Nov 12 '17 at 21:57
Take a look at the arch sshfs page I don't have time to write a long answer right now — Panther, Nov 12 '17 at 22:30
idmap only takes none, user, or file explicitly as options, you can't give it a userid. — Organic Marble, Nov 13 '17 at 02:09
I think you can use quoted username: sshfs 'user.name'@host.name:/remote/dir /local/dir Or you could use ~/.ssh/config file. But I do not think the username actually have a dot in it - click here. How did you create the user? What is the output of echo $USER? — pa4080, Nov 13 '17 at 22:42
The issue is less of the username itself and more of having an alternative means of entering it. — Andrew Shum, Nov 14 '17 at 02:04
I just tried the normal format again and it worked this time. Perhaps it was an issue with the server. — Andrew Shum, Nov 14 '17 at 02:13

score 8 · Answer 1 · answered Nov 25 '17 at 21:26

8

To pass SSH options to SSHFS, you can use ssh_command.

For example, to pass -c aes128-cbc to SSH, use:

sshfs -o ssh_command='ssh -c aes128-cbc' ...

answered Nov 25 '17 at 21:26

Philipp Claßen

4,574

score 1 · Answer 2 · answered May 03 '21 at 07:15

1

There are a couple of options you can pass right away: -p PORT (to change the ssh port from the default 22) -C (to specify you want compression)

answered May 03 '21 at 07:15

BxlSofty

111

sshfs -p 2233 [email protected]: /mnt/point just for an example – richardwhitney Nov 14 '23 at 04:31

score 0 · Answer 3 · answered Feb 11 '21 at 12:12

0

TL/DR: For options requiring a path, use absolute paths.

This bit of sshfs' man page suggest that it should just work fine with -o:

  -o SSHOPT=VAL
         ssh options (see man ssh_config)

However, I had troubles passing in a certificate file with -o CertificateFile=path/to/cert. It turns out that it only works with an absolute path to the certificate file, while plain ssh happily accepts a relative path.

answered Feb 11 '21 at 12:12

jlh

109

Would the downvoter care to explain? – jlh Jul 29 '21 at 12:16
Apparently that was me, and I don't remember doing it. If you make a bogus edit the site will let me withdraw the downvote. – Wilmer Aug 28 '21 at 16:33

How do I specify SSH options for SSHFS?

3 Answers3